LAUGESEN, R.; WATSON, N. A. Another way to say subsolution: the maximum principle and sums of Green functions. MATHEMATICA SCANDINAVICA, [S. l.], v. 97, n. 1, p. 127–153, 2005. DOI: 10.7146/math.scand.a-14968. Disponível em: https://www.mscand.dk/article/view/14968. Acesso em: 29 apr. 2024.